Thermal solar cell



FIG. 1 is a perspective view of a thermal solar cell showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a first side view thereof; and,

FIG. 7 is a second side view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for thermal solar cell, as shown and described. 